Congrats or Mazel Tov!
I love Ezra and Eden great names however I do think it would be strange to not have an 'e' name. I mean this sibling set Florence, Frederick & Freya works whereas Florence, Frederick & Verity doesn't because Verity with her 'V' name seems out-casted and doesn't visually look right. You'll have the same issue if you decide against using an 'e' name, I think anyway.

I like Ivy, Maya, Aliya, Emanuelle (prefer Emmanuelle without the other 'm' it feels strange) and Emilia. Out of these choices my favourite is Emilia. Just because Emilia sounds so great with Ezra and Eden they have a similar feel. They're short 'e' names and look really fresh together. I like this sibling set.